I second the University of Utah's resources. Very, very nice. You should also be able to find a number of decent animations of dna replication, electrophoresis etc... on Youtube.
I write about a great site in my post 23andMe Provides Authentic and Personalized Learning Opportunities .... You don't have to sign up for the service to use the site. There is great information there shared in interesting ways and it is authentic. The company was started by the wife of one of the founders of Google.
I use a bunch of different web resources during our genetics unit... I've listed a bunch of them below (there are a few more on our class website links page - http://sfsbiology.edublogs.org/links/)